In addition to merchandize you will find in most convenience stores, the store provides laundry, photo developing/printing, parcel delivery services.
They handle bus ticket from Tsukuba Center to Narita Airport including taking a reservation for it.
They also handle sets of bus tickets inside Tsukuba.

Location :
Between the Shokuin-Kaikanbldg. and the International
Center (Ext. 3907)

Hours :
Monday-Friday 9:00-19:00

Closed on National holidays, Year-end / New-year holiday and KEK set holiday.